Copolymer dispersant and dispersion using same

Abstract

A copolymer and a dispersion using same, the copolymer including two or more monomers selected from among a monomer containing two or more substituted or unsubstituted aromatic rings, a monomer containing a straight-chain or branched aliphatic hydrocarbon having 5 to 22 carbon atoms, and a polar monomer containing any one selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O) and carboxylic acid (COOH).

The invention claimed is: 
     
       1. A copolymer represented by Formula 1, 
       
         
           
           
               
               
           
         
         wherein in Formula 1, 
         R 1  to R 9  are each independently hydrogen or a straight-chain or branched-chain hydrocarbon having 1 to 4 carbon atoms, 
         R′ 1  is a straight-chain or branched-chain aliphatic hydrocarbon having 5 to 22 carbon atoms, 
         R′ 2  comprises two or more substituted or unsubstituted aromatic rings, 
         R′ 3  comprises any one or more selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH), 
         m and n are each independently integers of 0 to 4,000, 
         wherein when either m or n is 0, the remainder is not 0, and 
         l is an integer of 1 to 7,000. 
       
     
     
       2. The copolymer of  claim 1 , wherein R′ 1  comprises any one or more selected from the group consisting of n-pentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl, lauryl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, cetyl, n-hexadecyl, n-heptadecyl, stearyl, n-octadecyl, n-nonadecyl, n-icosyl, n-henicosyl, n-docosyl, isopentyl, isoheptyl, isooctyl, isononyl, isodecyl, isoundecyl, isododecyl, isotridecyl, isotetradecyl, isopentadecyl, isocetyl, isohexadecyl, isoheptadecyl, isostearyl, isooctadecyl, isononadecyl, isoicosyl, isohenicosyl, and isodocosyl. 
     
     
       3. The copolymer of  claim 1 , wherein R′ 2  comprises any one or more selected from the group consisting of substituted or unsubstituted benzyl, phenyl, phenoxy, naphthalene, anthracene, and pyrene. 
     
     
       4. The copolymer of  claim 1 , wherein R′ 2  comprises any one or more selected from the group consisting of 3-phenoxy benzyl, 1-naphthyl, 2-naphthyl, 9-anthracenylmethyl, and 1-pyrene methyl. 
     
     
       5. The copolymer of  claim 1 , wherein a monomer containing R′ 2  comprises any one or more selected from the group consisting of 3-phenoxy benzyl acrylate and (1-pyrene)methyl 2-methyl-2-propenoate ((1-pyrene) 2-methyl-2-propenoate). 
     
     
       6. The copolymer of  claim 1 , wherein the copolymer is a random or block copolymer. 
     
     
       7. The copolymer of  claim 1 , wherein the copolymer has a number average molecular weight of 5,000 to 1,000,000. 
     
     
       8. A dispersant comprising the copolymer of  claim 1 . 
     
     
       9. A dispersion comprising:
 the dispersant of  claim 8 ; and 
 a solvent. 
 
     
     
       10. The dispersion of  claim 9 , wherein the solvent comprises any one or more selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, and γ-butyrolactone. 
     
     
       11. The dispersion of  claim 9 , further comprising a carbon material. 
     
     
       12. The dispersion of  claim 11 , wherein the carbon material comprises any one or more selected from the group consisting of graphite, activated carbon, carbon black, a single-walled carbon nanotube, a multi-walled carbon nanotube, a fullerene, and graphene. 
     
     
       13. The dispersion of  claim 12 , wherein when the dispersion comprises 1.5 wt % of a non-volatile phase, the dispersion has a viscosity of 3,300 to 18,000 cps, and
 the single-walled carbon nanotube, the multi-walled carbon nanotube, or a combination thereof dispersed in the dispersion has a mean particle size (D50) of 10 μm or less. 
 
     
     
       14. An electrode slurry composition comprising the dispersant of  claim 8 . 
     
     
       15. An electrode comprising the dispersant of  claim 8 . 
     
     
       16. A secondary battery comprising the dispersant of  claim 8 .